Some global properties of the attractive Hubbard model in the superconducting phase: theT-matrix approximation in two dimensions
- 3 March 1997
- journal article
- letter
- Published by IOP Publishing in Journal of Physics: Condensed Matter
- Vol. 9 (9) , L111-L118
- https://doi.org/10.1088/0953-8984/9/9/001
Abstract
We have applied the fast Fourier transform, which allows one to compute efficiently convolution sums, to solve the set of self-consistent T-matrix equations to get the Green function of the two-dimensional attractive-U Hubbard model below , extending previous calculations by the same authors. Using a constant order parameter , we calculated as a function of the electron density and interaction strength U. These global results deviate from the BCS behaviour remarkably.Keywords
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